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st: ZIP

From   "Andre pierre" <[email protected]>
To   [email protected]
Subject   st: ZIP
Date   Thu, 21 Jul 2005 16:11:27 +0200

Dear all,

I'm trying to estimate zero inflated count models. The estimation works rather well until I introduce industry dummies and dummies for the legal structure of the firms. I then get the following message: "Hessian has become unstable or asymetric (NC)" (and almost all the dummies are droped due to colinearity)

Does any of you know what the problem is?

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